EP1531399A2 - Verfahren und System zur Vermeidung einer Verstopfung eines Datentransferbusses durch Bildkomprimierung - Google Patents

Verfahren und System zur Vermeidung einer Verstopfung eines Datentransferbusses durch Bildkomprimierung Download PDF

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Publication number
EP1531399A2
EP1531399A2 EP04257014A EP04257014A EP1531399A2 EP 1531399 A2 EP1531399 A2 EP 1531399A2 EP 04257014 A EP04257014 A EP 04257014A EP 04257014 A EP04257014 A EP 04257014A EP 1531399 A2 EP1531399 A2 EP 1531399A2
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European Patent Office
Prior art keywords
image
section
image data
data
decompression
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Withdrawn
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EP04257014A
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English (en)
French (fr)
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EP1531399A3 (de
Inventor
Yasuji Obuchi
Shigeki Imai
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Sharp Corp
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Sharp Corp
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Publication of EP1531399A3 publication Critical patent/EP1531399A3/de
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/24—Systems for the transmission of television signals using pulse code modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
    • H04N19/423—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/387—Composing, repositioning or otherwise geometrically modifying originals

Definitions

  • the present invention relates to an image information processing system and an image information processing method for, for example, receiving, outputting (displaying), accumulating (storing), and transmitting/receiving static images or moving images. More particularly, the present invention relates to an image information processing system and method suitable for mobile electronic apparatuses, which are mainly used outdoors and require low power consumption, such as mobile telephones, personal digital assistants (PDAs), digital still cameras, mobile personal computers, and the like.
  • PDAs personal digital assistants
  • image data input via an image input section e.g., a CCD camera, a CCD image sensor, etc.
  • a storage section e.g., an ROM, etc.
  • the image data is compressed using a computation section (e, g., a central processing unit (CPU), a DSP, etc.), and the resultant compressed image data is stored into the storage section.
  • a computation section e.g., a central processing unit (CPU), a DSP, etc.
  • compressed image data is read out from the storage section, and the image data is decompressed using the computation section, such as a CPU, a DSP, or the like.
  • the decompressed data is transferred via a system bus line to an image display section, such as a liquid crystal display apparatus or the like, which in turn displays the image data on its display screen.
  • an image display section such as a liquid crystal display apparatus or the like
  • a conventional image information processing system is disclosed in Japanese Laid-Open Publication No. 2002-232680.
  • Figure 10 is a block diagram showing an exemplary configuration of a conventional image information processing system.
  • an image input section 101 for receiving an image e.g., a CCD camera, a CCD image sensor, etc.
  • an image display section 102 for displaying an image e.g., a liquid crystal display apparatus, etc.
  • a communication section 104 for transmitting/receiving image data e.g., a system control section 105 for controlling each section of the image information processing system 100
  • the image input section 101 and the image display section 102 are connected to each other via the system bus line 106 as well as a data transfer line 107 which is used for monitor display.
  • the system control section 105 incorporates an image compression/decompression section 105a for compressing/decompressing image data, which is implemented as a circuit (hardware) or a program (software).
  • the system bus line 106 is used as a data transfer bus line via which data is transferred, and a control signal bus line via which a control signal is transferred.
  • the above-described arrangement functions as follows.
  • the image input section 101 e.g., a CCD camera, a CCD image sensor, etc.
  • the captured image data is transferred and accumulated into the storage section 103 via the system bus line 106.
  • the image data accumulated in the storage section 103 is read out from the storage section 103 in accordance with control by the system control section 105.
  • the image data is compressed by the image compression/decompression section 105a in the system control section 105, and the image data is stored again as compressed image data into the storage section 103.
  • the image compression/decompression section 105a is incorporated in the system control section 105.
  • the image compression/ decompress ion section 105a may be separately connected to the system bus line 106. In either case, the image data accumulated in the storage section 103 is compressed by the image compression section in accordance with control by the system control section 105, and the compressed image data is written into the storage section 103.
  • Image data is replayed as follows. Any image data is selectively read out from compressed image data accumulated in the storage section 103 using the system control section 105.
  • the read image data is decompressed by the image compression/decompression section 105a, and the resultant data is transferred to the image display section 102 and is displayed on a display screen.
  • the decompressed image data may be temporarily stored in the storage section 103, and then transferred to the image display section 102 for displaying.
  • the image processing system 100 will be further described, where image data is received.
  • the communication section 104 generally receives compressed image data.
  • the compressed image data received by the communication section 104 is accumulated in the storage section 103. After the compressed image data is accumulated in the storage section 103, the image is replayed in the manner described above.
  • image data is transferred to the image compression/decompression section 105a for decompression while the image data is, or is not, accumulated in the storage section 103. Thereafter, the decompressed data is transferred to the image display section 102 for displaying.
  • the size of the image data from the image input section 101 is resized to fit a display size by, for example, sampling. Thereafter, the image data is transferred via the data transfer line 107 for monitor display to the image display section 102 which in turn displays the image data on a display screen.
  • the image compression/decompression section 105a, the image input section 101, and the image display section 102 are generally connected to one another via the system bus line 106 in conventional image information processing systems.
  • non-compressed image data has a size 5 to several tens times larger than that of its compressed image data. Therefore, the amount of data transferred on the conventional system bus line 106 is large, thus creating a bottleneck.
  • the data transfer capacity of the system bus line 106 is generally increased by increasing the width or clock frequency of the bus line. In this case, however, the number of lines or power consumption is increased. In the future, an increasingly larger data transfer capacity is required for the image information processing system 100 to address increases in image size and the amount of moving image processing.
  • an image information processing system which comprises an image input section for receiving image data, a storage section for storing the image data, and a control section for controlling the image input section and the storage section.
  • the image input section, the storage section and the control section are connected together via a data transfer bus line.
  • An image compression section for compressing the image data is provided within or adjacent to the image input section.
  • the control section controls the image compression section to compress non-compressed image data input from the image input section, transfers the compressed image data via the data transfer bus line to the storage section, and controls the storage section to store the compressed image data.
  • an image information processing system which comprises a storage section for storing image data, an image display section for displaying the image data, and a control section for controlling the storage section and the image display section.
  • the storage section, the image display section and the control section are connected together via a data transfer bus line.
  • An image decompression section for decompressing compressed image data is provided within or adjacent to the image display section.
  • the control section transfers compressed image data stored in the storage section via the data transfer bus line to the image decompression section, controls the image decompression section to decompress the compressed image data, and controls the image display section to display/replay the decompressed image data.
  • an image information processing system which comprises an image input section fox receiving image data, a storage section for storing the image data, an image display section for displaying the image data, and a control section for controlling the image input section, the storage section and the image display section.
  • the image input section, the storage section, the image display section and the control section are connected together via a data transfer bus line.
  • An image compression section for compressing the image data is provided within or adjacent to the image input section.
  • An image decompression section for decompressing compressed image data is provided within or adjacent to the image display section.
  • the control section controls the image compression section to compress non-compressed image data input from the image input section, transfers the compressed image data via the data transfer bus line to the storage section, and controls the storage section to store the compressed image data.
  • the control section transfers compressed image data stored in the storage section via the data transfer bus line to the image decompression section, controls the image decompression section to decompress the compressed image data, and controls the image display section to display/replay the decompressed image data.
  • the image compression section has a compression rate predetermined depending on a data transfer rate.
  • an image information processing system which comprises an image input /display apparatus including an image input section for receiving image data and an image display section for displaying the image data, a storage section for storing the image data, and a control section for controlling the image input section, the image display section and the storage section.
  • the image input/display apparatus, the storage section and the control section are connected together via a data transfer bus line.
  • An image compression/decompression section for compressing/decompressing the image data is provided within or adjacent to the image input/display apparatus.
  • the control section controls the image compression/decompression section to compress non-compressed image data input from the image input section, transfers the compressed image data via the data transfer bus line to the storage section, and controls the storage section to store the compressed image data.
  • the control section transfers compressed image data stored in the storage section via the data transfer bus line to the image compression/decompression section, controls the image compression/decompression section to decompress the compressed image data, and controls the image display section to display/replay the decompressed image data.
  • an image information processing system which comprises an image input /display apparatus including an image input section for receiving image data and an image display section for displaying the image data, and a control section for controlling the image input section and the image display section.
  • An image compression/decompression section for compressing/decompressing the image data is provided within or adjacent to the image input/display apparatus.
  • the control section controls the image compression/decompression section to compress/decompress non-compressed image data input from the image input section and controls the image display section to perform monitor display of the image data.
  • a size of the image data input from the image input section is shaped by compression and decompression of the image data by the image compression/decompression section to fit a display size of the image display section.
  • the image compression/decompression section has a compression rate predetermined depending on a data transfer rate.
  • an image information processing system which comprises a storage section for storing an image data, an image display section for displaying the image data, a communication section for transmitting/receiving the image data, and a control section for controlling the storage section, the image display section and the communication section.
  • the storage section, the image display section, the communication section and the control section are connected together via a data transfer bus line.
  • An image decompression section for decompressing compressed image data is provided within or adjacent to the image display section.
  • the control section controls the storage section to store compressed image data received by the communication section, transfers the compressed image data stored in the storage section via the data transfer bus line to the image decompression section, controls the image decompression section to decompress the compressed image data, and controls the image display section to display/replay the decompressed image data.
  • an image information processing system which comprises a storage section for storing an image data, an image display section for displaying the image data, a communication section for transmitting/receiving the image data, and a control section for controlling the storage section, the image display section and the communication section.
  • the storage section, the image display section, the communication section and the control section are connected together via a data transfer bus line.
  • An image decompression section for decompressing compressed image data is provided within or adjacent to the image display section.
  • the control section controls the storage section to store compressed image data received by the communication section, and at the same time, transfers the oompressed image data, without storing the compressed image data into the storage section, via the data transfer bus line to the image decompression section, controls the image decompression section to decompress the compressed image data, and controls the image display section to display/replay the decompressed image data.
  • the image compression section performs image compression based on an image compression algorithm requiring a circuit scale or program size smaller than a predetermined one.
  • the image decompression section performs image decompression based on an image decompression algorithm requiring a circuit scale or program size smaller than a predetermined one.
  • the image compression/decompression section performs image compression/decompression based on an image compression/decompression algorithm requiring a circuit scale or program size smaller than a predetermined one.
  • the image compression section includes two or more image compression sections having different image compression algorithms.
  • the image decompression section includes two or more image decompression sections having different image decompression algorithms.
  • the image compression/decompression section includes two or more image compression/decompression sections having different image compression/decompression algorithms.
  • an image information processing method for an image information processing system.
  • the image information processing system comprises an image input section for receiving image data, a storage section for storing the image data, and a control section for controlling the image input section and the storage section.
  • the image input section, the storage section and the control section are connected together via a data transfer bus line.
  • An image compression section for compressing the image data is provided within or adjacent to the image input section.
  • the method comprises using the control section to control the image compression section to compress non-compressed image data input from the image input section, transfer the compressed image data via the data transfer bus line to the storage section, and control the storage section to store the compressed image data.
  • an image information processing method for an image information processing system.
  • the image information processing system comprises a storage section for storing image data, an image display section for displaying the image data, and a control section for controlling the storage section and the image display section.
  • the storage section, the image display section and the control section are connected together via a data transfer bus line.
  • An image decompression section for decompressing compressed image data is provided within or adjacent to the image display section.
  • the method comprises using the control section to transfer compressed image data stored in the storage section via the data transfer bus line to the image decompression section, control the image decompression section to decompress the compressed image data, and control the image display section to display/replay the decompressed image data.
  • an image information processing method for an image information processing system.
  • the image information processing system comprises an image input section for receiving image data, a storage section for storing the image data, an image display section for displaying the image data, and a control section for controlling the image input section, the storage section and the image display section.
  • the image input section, the storage section, the image display section and the control section are connected together via a data transfer bus line.
  • An image compression section for compressing the image data is provided within or adjacent to the image input section.
  • An image decompression section for decompressing compressed image data is provided within or adjacent to the image display section.
  • the method comprises using the control section to control the image compression section to compress non-compressed image data input from the image input section, transfer the compressed image data via the data transfer bus line to the storage section, and control the storage section to store the compressed image data, and using the control section to transfer compressed image data stored in the storage section via the data transfer bus line to the image decompression section, control the image decompression section to decompress the compressed image data, and control the image display section to display/replay the decompressed image data.
  • an image information processing method for an image information processing system.
  • the image information processing system comprises an image input/display apparatus including an image input section for receiving image data and an image display section for displaying the image data, a storage section for storing the image data, and a control section for controlling the image input section, the image display section and the storage section.
  • the image input/display apparatus, the storage section and the control section are connected together via a data transfer bus line.
  • An image compression/decompression section for compressing/ decompressing the image data is provided within or adjacent to the image input/display apparatus.
  • the method comprises using the control, section to control the image compression/ decompression section to compress non-compressed image data input from the image input section, transfer the compressed image data via the data transfer bus line to the storage section, and control the storage section to store the compressed image data, and using the control section to transfer the compressed image data stored in the storage section via the data transfer bus line to the image compression/decompression section, control the image compression/decompression section to decompress the compressed image data, and control the image display section to display/replay the decompressed image data.
  • an image information processing method for an image information processing system.
  • the image information processing system comprises an image input/display apparatus including an image input section for receiving image data and an image display section for displaying the image data, and a control section for controlling the image input section and the image display section.
  • An image compression/decompression section for compressing/decompressing the image data is provided within or adjacent to the image input section.
  • the method comprises using the control section to control the image compression/decompression section to compress/decompress non-compressed image data input from the image input section and control the image display section to perform monitor display of the image data.
  • an image information processing method for an image information processing system.
  • the image information processing system comprises a storage section for storing an image data, an image display section for displaying the image data, a communication section for transmitting/receiving the image data, and a control section for controlling the storage section, the image display section and the communication section.
  • the storage section, the image display section, the communication section and the control section are connected together via a data transfer bus line.
  • An image decompression section for decompressing compressed image data is provided within or adjacent to the image display section.
  • the method comprises using the control section to control the storage section to store compressed image data received by the communication section, transfer the compressed image data stored in the storage section via the data transfer bus line to the image decompression section, control the image decompression section to decompress the compressed image data, and control the image display section to display/replay the decompressed image data.
  • an image information processing method for an image information processing system.
  • the image information processing system comprises a storage section for storing an image data, an image display section for displaying the image data, a communication section for transmitting/receiving the image data, and a control section for controlling the storage section, the image display section and the communication section.
  • the storage section, the image display section, the communication section and the control section are connected together via a data transfer bus line.
  • An image decompression section for decompressing compressed image data is provided within or adjacent to the image display section.
  • the method comprises using the control section to control the storage section to store compressed image data received by the communication section, and at the same time, transfer the compressed image data, without storing the compressed image data into the storage section, via the data transfer bus line to the image decompression section, control the image decompression section to decompress the compressed image data, and control the image display section to display/replay the decompressed image data.
  • image data input from an image input section is compressed by an image compression section provided within or adjacent to the image input section before being transferred via a data transfer bus line to a storage section or the like.
  • image compression section provided within or adjacent to the image input section before being transferred via a data transfer bus line to a storage section or the like.
  • compressed image data accumulated in the storage section is transferred without decompression via the data transfer bus line to the image display section (e. g., a liquid crystal display apparatus, etc.) and is decompressed by an image decompression section provided within or adjacent to the image display section. Thereby, the amount of data transferred for image display/replay can be reduced.
  • the image display section e. g., a liquid crystal display apparatus, etc.
  • the input image data can be resized to fit a display size of an image display section.
  • Compressed image data received by a communication section is transferred via a data transfer bus line to an image display section.
  • the compressed image data is decompressed by an image decompression section provided within or adjacent to the image display section.
  • the decompressed image data is displayed/replayed by the image display section. Thereby, the amount of transferred data is reduced when an image is received.
  • the image compression section and the image decompression section can be easily incorporated into an image input section and an image display section.
  • image data compressed in different manners can be transmitted/received and displayed.
  • the data transfer amount can be reduced.
  • a transfer time can be reduced in proportion to the reduction of the data transfer amount.
  • the processing performance of a data transfer bus line can be increased up to an image size corresponding to the reciprocal of a compression rate. Therefore, the data transfer amount of the data transfer bus line can be increased without increasing the width of a bus line. A larger image size and an increased amount of moving image processing can be handled.
  • the clock frequency of a data transfer bus line can be increased by a factor corresponding to a compression rate, resulting in a reduction in power consumption in proportion to the operating frequency. This is because the data transfer amount can be reduced by a factor corresponding to the compression rate.
  • the invention described herein makes possible the advantages of providing an image information processing system and an image information processing method, in which the amount of data transferred on a system bus line is reduced, thereby making it possible to use a lower clock frequency to prevent an increase in power consumption, and address increases in image size and the amount of moving image processing.
  • Embodiments 1 to 6 of the image processing system of the present invention will be described with reference to the accompanying drawings, where the present invention is applied to a mobile electronic apparatus (e.g., a mobile telephone).
  • a mobile electronic apparatus e.g., a mobile telephone
  • the image processing system of the present invention is herein applied to a general mobile telephone, the present invention is not limited to this.
  • Figure 1 is a block diagram showing an exemplary basic configuration of the image information processing system of the present invention.
  • an image input section 1 for receiving an image e.g., a CCD camera, a CCD image sensor, etc.
  • an image display section 2 for displaying an image e.g., a liquid crystal display apparatus, etc.
  • a communication section 4 for transmitting/receiving image data e.g., a liquid crystal display apparatus, etc.
  • a system control section 5 for controlling each section of the image information processing system 10 are connected to one another via a system bus line 6 as a data transfer bus line.
  • the image information processing system 10 is different from the conventional image information processing system 100 of Figure 10 in that the functions of the image compression/decompression section 105a of Figure 10 are separated, i.e., an image compression section 1a is incorporated in the image input section 1 while an image decompression section 2a is incorporated in the image display section 2.
  • image data input to the image input section 1 can be supplied to the image compression section 1a for data compression, but not via the system bus line 6.
  • compressed image data supplied to the image decompression section 2a is decompressed by the image decompression section 2a, and the decompressed image data can be supplied to the image display section 2, but not via the system bus line 6.
  • the image display section 2 replays/displays the image data on a display screen.
  • the image information processing system 10 of the present invention of Figure 1 is compared with the conventional image information processing system 100 of Figure 10 in terms of the state of image data transferred on the system bus line 6 (compressed data or non-compressed data) and the number of times of transfer during each of steps of imaging, replay, transmission, and monitoring.
  • the image information processing system 10 is compared with the conventional image information processing system 100. Firstly, comparison is made on the image capturing process.
  • the image information processing system 10 of the present invention of Figure 1 when an image is taken using the image input section 1 (e.g., a CCD camera, a CCD image sensor, etc.), the captured image data is compressed by the image compression section 1a and the compressed image data is transferred and accumulated into the storage section 3 via the system bus line 6. In this case, compressed image data is transfer once via the system bus line 6.
  • the image input section 1 e.g., a CCD camera, a CCD image sensor, etc.
  • the captured image data is transferred and accumulated into the storage section 103 via the system bus line 106.
  • the image data accumulated in the storage section 103 is read out from the storage section 103 in accordance with control by the system control section 105.
  • the image data is compressed by the image compression/decompression section 105a in the system control section 105 , and the image data is stored as compressed image data into the storage section 103.
  • non-compressed image data is transferred twice and compressed image data is transferred once, via the system bus line 106, i.e., image data is transferred a total of three times.
  • images are replayed as follows. Any image data is selectively read out from compressed image data accumulated in the storage section 3 using the system control section 5.
  • the selected compressed image data is transferred via the system bus line 6 to the image display section 2, and is decompressed by the image decompression section 2a.
  • the decompressed image data is displayed on a display screen of the image display section 2. In this case, compressed image data is transferred only once via the system bus line 6.
  • images are replayed as follows. Any image data is selectively read out from compressed image data accumulated in the storage section 103 using the system control section 105.
  • the selected image data is decompressed by the image compression/decompression section 105a, and the decompressed image data is transferred to the image display section 102 for displaying.
  • the decompressed image data may be temporarily stored in the storage section 103, and thereafter, may be transferred to the image display section 102.
  • non-compressed image data is transferred twice and compressed image data is transferred once, via the system bus line 106, i.e., image data is transferred a total of three times.
  • compressed image data is input to the communication section 4, and thereafter, the image data is accumulated in the storage section 3. After the image data is accumulated in the storage section 3, the image data is replayed in the manner described above. In this case, compressed image data is transferred twice via the system bus line 6.
  • a method called streaming may be used. According to this method, image data is transferred to the image decompression section 2a for decompression while the image data is, or is not, accumulated in the storage section 3. Thereafter, the decompressed data is transferred to the image display section 2 for displaying it on a display screen thereof. In this case, compressed image data is transferred once via the system bus line 6.
  • the compressed image data is accumulated in the storage section 103.
  • the image data is replayed in the manner described above.
  • non-compressed image data is transferred twice and compressed image data is transferred twice, via the system bus line 106, i.e., image data is transferred a total of four times.
  • a method called streaming may be used. According to this method, image data is transferred to the image compression/decompression section 105a for decompression while the image data is, or is not, accumulated in the storage section 103. Thereafter, the decompressed data is transferred to the image display section 102 for displaying it on a display screen thereof.
  • monitor display is performed as follows. A size of image data from the image input section 1 is resized to fit a display size by, for example, sampling. Thereafter, the image data is transferred via the data transfer line 7 for monitor display to the image display section 102 which in turn displays the image data on a display screen. In this case, sampling image data is transferred once via the data transfer line 7.
  • the resizing can be achieved by utilizing compression and decompression of image data by the image compression section 1a and the image decompression section 2a. In this case, compressed image data is transferred once via the system bus line 6.
  • monitor display is performed as follows.
  • the size of the image data from the image input section 101 is resided to fit a display size by, for example, sampling.
  • the image data is transferred via the data transfer line 107 for monitor display to the image display section 102 which in turn displays the image data on a display screen.
  • sampling image data is transferred once via the data transfer line 107.
  • compression rate of a compression technique commonly used in image information processing systems is shown in Table 2 below.
  • Compression rate Standard compression rate JPEG still image
  • JPEG4 moving image
  • a standard compression rate which is practically used where a certain level of image quality is secured, is optionally used herein as a compression/decompression rate.
  • static images are compressed at a compression rate of 1/5 to 1/30 using JPEG, and moving images are compressed at a compression rate of 1/10 to 1/50 using MPEG4.
  • the above-described compression rate can be considered as a transfer load ratio of non-compressed data and compressed data. Therefore, it is understood that the transfer load can be significantly reduced by transferring compressed image data via the system bus line 6, but not non-compressed image data.
  • Embodiment 1 of the present invention will be described below, where input non-compressed image data is compressed, the compressed image data is transferred and stored in a storage section 3 via a system bus line 6.
  • FIG. 2 is a block diagram showing a configuration of an image information processing system according to Embodiment 1 of the present invention.
  • an image input section 1 for receiving an image e.g., a CCD camera, a CCD image sensor, etc.
  • an image display section 2A for displaying an image e.g., a liquid crystal display apparatus, etc.
  • a communication section 4 for transmitting/receiving image data e.g., a liquid crystal display apparatus, etc.
  • a system control section 6 for controlling each section of the image information processing system 11 are connected to one another via a system bus line 6 as a data transfer bus line.
  • the image input section 1 incorporates an image compression section 1a, via which compressed image data is input from the image input section 1 onto the system bus line 6.
  • image data taken by the image input section 1 is compressed before being output onto the system bus line 6. Thereafter, the image data is accumulated in the storage section 3 . Therefore, the amount of data transferred on the system bus line 6 is reduced by a factor corresponding to a compression rate as shown in Table 2, i.e., can be significantly reduced.
  • the image information processing system 11 is different from the conventional image information processing system 100 in which non-compressed image data is transferred on the system bus line 6. Note that comparison is made under the same operating environment.
  • the processing performance of the system bus line 6 can be increased up to an image size corresponding to the reciprocal of a compression rate as shown in Table 2. For example, if the compression rate is 1/10, data having an image size 10 times than that of the conventional image information processing system 100 can be transferred for the same length of time.
  • an image decompression section may be provided in either the image display section 2A or the system control section 5 , or alternatively, does not have to be provided in the image information processing system 11 .
  • the image display section 2A and the communication section 4 are not particularly used in the image information processing system 11 , and do not have to be provided in Figure 2 .
  • Embodiment 2 of the present invention will be described below, where stored compressed image data is transferred via a system bus line 6 to an image decompression section, which in turn decompresses the data for replaying/displaying.
  • Figure 3 is a block diagram showing a configuration of an image information processing system according to Embodiment 2 of the present invention.
  • an image input section 1A for receiving an image e.g., a CCD camera, a CCD image sensor, etc.
  • an image display section 2 for displaying an image e.g., a liquid crystal display apparatus, etc.
  • a communication section 4 for transmitting/receiving image data e.g., a liquid crystal display apparatus, etc.
  • a system control section 5 for controlling each section of the image information processing system 12 are connected to one another via a system bus line 6 as a data transfer bus line.
  • the image display section 2 incorporates an image decompression section 2a , which receives compressed image data via the system bus line 6 and decompresses it for replaying/displaying.
  • compressed image data accumulated in the storage section 3 is input onto the system bus line 6 without decompression.
  • the compressed image data is decompressed by the image decompression section 2a , and is replayed/displayed by the image display section 2 . Therefore, the amount of data transferred on the system bus line 6 can be significantly reduced.
  • a transfer time can be reduced as described in Embodiment 1, resulting in a reduction in power consumption.
  • the processing performance of the system bus line 6 can be increased, resulting in a reduction in power consumption.
  • the clock frequency of the system bus line 6 can be reduced, resulting in an improvement in the reliability of the image information processing system 12 .
  • the display size of the image display section 2 is often smaller than the size of an image stored in the storage section 3 .
  • the data transfer amount of thumbnail display images can also be reduced in proportion to the compression rate, and therefore, a reduction in data transfer amount can be increased, though the reduction is not larger than when an image is input.
  • an image compression section may be provided in either the image input section 1A or the system control section 5 , or alternatively, does not have to be provided in the image information processing system 12 .
  • the image input section 1A and the communication section 4 are not particularly used in the image information processing system 12 , and do not have to be provided in Figure 3 .
  • Embodiment 3 of the present invention will be described below.
  • input non-compressed image data is compressed, and the compressed image data is transferred via a system bus line 6 to a storage section 3 and is stored in the storage section 3 .
  • the stored compressed image data is transferred via the system bus line 6 to an image decompression section, which in turn decompresses the data for displaying/replaying.
  • Figure 4 is a block diagram showing a configuration of an image information processing system according to Embodiment 3 of the present invention.
  • an image input section 1 for receiving an image e.g., a CCD camera, a CCD image sensor, etc.
  • an image display section 2 for displaying an image e.g., a liquid crystal display apparatus, etc.
  • a storage section 3 for accumulating image data e.g., a liquid crystal display apparatus, etc.
  • a system control section 5 for controlling each section of the image information processing system 13 are connected to one another via a system bus line 6 as a data transfer bus line.
  • the image input section 1 incorporates an image compression section 1a .
  • the image display section 2 incorporates an image decompression section 2a .
  • image data taken by the image input section 1 is compressed before being output onto the system bus line 6 , and thereafter, is accumulated in the storage section 3 . Therefore, the amount of data transferred on the system bus line 6 can be significantly reduced by a factor corresponding to the compression rate as shown in Table 2.
  • image information processing system 13 comprised image data accumulated in the storage section 3 is input onto the system bus line 6 without decompression as in Embodiment 2.
  • the compressed image data is decompressed by the image decompression section 2a , and is replayed/displayed by the image display section 2a . Therefore, the amount of data transferred on the system bus line 6 can be significantly reduced.
  • a transfer time can be reduced as described in Embodiment 1, resulting in a reduction in power consumption.
  • the processing performance of the system bus line 6 can be increased, resulting in a reduction in power consumption.
  • the clock frequency of the system bus line 6 can be reduced, resulting in an improvement in the reliability of the image information processing system 13 .
  • An image information processing system such as a surveillance camera or the like, can be achieved by incorporating the image compression section 1a in the image input section 1 as in Embodiment 1 or by providing the image compression section 1a adjacent to the image input section 1 .
  • an image information processing system image display processing system
  • image display processing system such as an internet viewer or the like, can be achieved by incorporating the image decompression section 2a in the image display section 2 as in Embodiment 2 or by providing the image decompression section 2a adjacent to the image display section 2 .
  • an image information processing system such as a mobile telephone with a built-in camera or the like, can be achieved by providing the image compression section 1a within or adjacent to the image input section 1 and by providing the image decompression section 2a within or adjacent to the image display section 2 as in Embodiment 3.
  • the communication section 4 is not particularly used in Embodiment 3, and does not have to be provided in Figure 4 .
  • An image information processing system according to Embodiment 4 of the present invention will be described below, which comprises an image compression/decompression section having an image data compression function and an image data decompression function.
  • Figure 5 is a block diagram showing a configuration of the image information processing system according to Embodiment 4 of the present invention.
  • an image input/display apparatus 8 having an image input section 1B for receiving an image (e.g., a CCD camera, a CCD image sensor, etc.) and an image display section 2B for displaying an image (e.g., a liquid crystal display apparatus, etc.), a storage section 3 for accumulating image data, a communication section 4 for transmitting/receiving image data, and a system control section 5 for controlling each section of the image information processing system 14 , are connected to one another via a system bus line 6 as a data transfer bus line.
  • a system bus line 6 as a data transfer bus line.
  • the image input/display apparatus 8 incorporates an image compression/decompression section 8a , into which functions of an image compression section and an image decompression section are integrated and which is provided adjacent to the image input section 1 and the image display section 2 .
  • the image compression/decompression section 8a has the integrated functions of the image compression section and the image decompression section. Therefore, a common circuit (s) can be shared by the two sections, resulting in a reduction in circuit size and cost.
  • the two sections can share a connection to the system bus line 6 and can be integrated with a frame memory or the like.
  • the image compression section and the image decompression section are preferably separated in a full duplex system (e.g., a television telephone, etc.), in which both image input and image display are performed simultaneously, as in Embodiment 3.
  • image data which is transferred on the system bus line 6 is necessarily compressed image data, thereby making it possible to reduce the amount of data transferred on the system bus line 6 significantly.
  • a transfer time can be reduced as described in Embodiment 1, resulting in a reduction in power consumption.
  • the processing performance of the system bus line 6 can be increased, resulting in a reduction in power consumption.
  • the clock frequency of the system bus line 6 can be reduced, resulting in an improvement in the reliability of the image information processing system 12 .
  • the degree of freedom of design is increased when the clock frequency is determined while considering the efficiency of the whole system.
  • a data transfer line 107 for monitor display is provided between the image input section 101 and the image display section 102 .
  • image data input from the image input section 101 is shaped (resized) by sampling to fit the display size of the image display emotion 102 , thereby improving the efficiency of monitor display.
  • a compression rate which is adapted to fit the size of input image and the size of displayed image is determined using the image compression/decompression section 8a adjacent to an image input section 1B and an image display section 2B .
  • image data input from the image input section 1B is shaped (resized) by the image compression/decompression section 8a as indicated by arrow B to fit the display size of the image display section 2B .
  • the resized image data is supplied to the image display section 2B .
  • a transfer rate (clock frequency) from the image input section 1B to the image display section 2B can be made constant, thereby making it possible to support an image information processing system which handles input or output (displayed) images having different sizes where the bus lines have the same specification.
  • Table 3 below shows an example where different image sizes are handled.
  • the data amount ratio is 1/1. In this case, image data is not compressed and the compression rate is set to 1/1.
  • the size of input image size is 100,000 pixels and the display size is QCIF
  • the data amount ratio is 2. In this case, the compression rate of image data is set to 1/2.
  • the size of input image is 350,000 pixels and the display size is QCIF
  • the data amount ratio is 2. In this case, the compression rate of image data is set to 1/2.
  • the data amount ratio is 8. In this case, the compression rate of image data is set to 1/8.
  • the size of input image is 1,000,000 pixels and the display size is CIF/QVGA, the data amount ratio is 8. In this case, the compression rate of image data is 1/8.
  • image data input from the image input section 1B can be resized to fit the display size of the image display section 2B .
  • image data is transferred at a constant transfer rate. It will be clearly understood that when image data having a constant display size is transferred, the clock frequency of a bus line can be reduced depending on the compression rate, resulting in a reduction in power consumption.
  • Embodiment 5 of the present invention an information processing system, which transmits/receives an image to/from the communication section 4 , will be described.
  • Figure 7 is a block diagram showing a configuration of the image information processing system of Embodiment 5.
  • an image input section 1 for receiving an image e.g., a CCD camera, a CCD image sensor, etc.
  • an image display section 2 for displaying an image e.g., a liquid crystal display apparatus, etc.
  • a communication section 4 for transmitting/receiving image data e.g., a system control section 5 for controlling each section of the image information processing system 15
  • a system bus line 6 as a data transfer bus line.
  • an image compression section 1a is incorporated into the image input section 1 while an image decompression section 2a is incorporated into the image display section 2 .
  • Data transmitted/received to/from the communication section 4 is generally compressed data in order to reduce communication cost.
  • Received compressed data is accumulated in the storage section 3 before replaying and the like. Similar to the above-described Embodiments 1 to 4, all data are transferred as compressed data on the system bus line 6 . Therefore, the same effects as described in Embodiments 1 to 4 can be obtained.
  • compressed image data received by the communication section 4 is transferred directly to the image display section 2 , is decompressed by the image decompression section 2a incorporated in the image display section 2 , and is replayed/displayed on the image display section 2 .
  • compressed data received by the communication section 104 is transferred to the image compression/decompression section 105a of the system control section 105 , which in turn performs data decompression.
  • a large amount of decompressed image data is transferred via the system bus line 106 to the image display section 102 . Therefore, as compared to the image information processing system 15 , the data transfer amount of the system bus line 6 is increased, resulting in a lower transfer rate. For this reason, for example, it will be clearly understood that the conventional image information processing system 100 can handle only a smaller number of replay frames or a smaller image size.
  • an image compression section can be provided adjacent to or within an existing image input section.
  • an image decompression section can be provided adjacent to or within an existing image display section.
  • An example of such an image compression algorithm having a small circuit scale includes DMNA (Digital Media New Algorithm, produced by Techno Mathematical Co., Ltd.).
  • DMNA Digital Media New Algorithm, produced by Techno Mathematical Co., Ltd.
  • the DMNA can reduce significantly the amount of computation, such as DCT calculation or the like.
  • the same performance can be achieved with a circuit scale about 1/3 of that of conventional MPEG4 image compression techniques.
  • an image compression algorithm has been usually incorporated into a separate LSI.
  • the image compression section 1a can be integrated with the image input section 1 into an integrated LSI.
  • the image display section 2 and the image decompression section 2a can be easily integrated together.
  • the image compression/decompression algorithm having a small circuit scale or program size is very useful when the image compression section 1a and the image decompression section 2a are integrated together as the image compression/decompression section 8a which is provided adjacent to or within the image input section 1 and the image display section 2 as shown in Figure 5 .
  • Embodiment 6 of the present invention an image information processing system will be described, which comprises two or more decompression sections based on different image compression/decompression algorithms requiring a small circuit scale or program size.
  • Figure 8 is a block diagram showing a configuration of the image information processing system of Embodiment 6.
  • an image input section 101 for receiving an image e.g., a CCD camera, a CCD image sensor, etc.
  • an image display section 2C for displaying an image e.g., a liquid crystal display apparatus, etc.
  • a communication section 4 for transmitting/receiving image data e.g., a liquid crystal display apparatus, etc.
  • a system control section 5 for controlling each section of the image information processing system 16 , are connected to one another via a system bus line 6 as a data transfer bus line.
  • an image compression section 1a is incorporated into the image input section 1 .
  • an image decompression section 2b comprising two image decompression sections N and M having different algorithms is incorporated into the image display section 2C .
  • NANCY image compression technique produced by Office NOA, Inc.
  • SMSP Structured Meta Scale Polygon
  • image compression/decompression is performed based on DMNA in the image compression section 1a and the image decompression section N, while compressed image is decompressed using SMSP algorithm received from the communication section 4 in the image decompression section M and is replayed/displayed on the image display section 2 .
  • Figure 9 shows an image information processing system 17 , which is a variation of the image information processing system 16 of Embodiment 6.
  • an image compression/decompression section 9a comprising image compression/decompression sections P and Q based on different algorithms is incorporated into the image input/display apparatus 9 , being provided adjacent to or within an image input section 1D and an image display section 2D .
  • image compressed data based on two different compression techniques can be received and displayed and compression techniques for images to be transmitted can be selected. Therefore, image data which is compressed using a compression method suitable for an image compression section at the receiver side, can be transmitted. Further, it will be clearly understood that the image information processing system 17 can perform a function as a converter for conversion of compression techniques.
  • the image input section 1 , the image display section 2 , the storage section 3 , the communication section 4 , and the system control section 5 are connected together via the system bus line 6 .
  • Non-compressed image data input from the image input section 1 is compressed in the image compression section 1a which is provided within or adjacent to the image input section 1 , and is transferred via the system bus line 6 to the storage section 3 .
  • the compressed image data accumulated in the storage section 3 is transferred via the system bus line 6 to the image decompression section 2a , which in turn decompresses the data.
  • the decompressed data is displayed/replayed on the image display section 2 .
  • the image compression section and the image decompression section are based on algorithms having a circuit scale or a program size smaller than a predetermined value. Therefore, the image compression section and the image decompression section can be easily incorporated into the image display section and the image input section.
  • the size smaller than the predetermined value will be described below.
  • the small program size and circuit scale make it easier to develop an LSI into which other modules are integrated.
  • conventional MPEG4 requires about 500,000 gates
  • MPEG4 using DMNA requires about 1/3 of that circuit scale. Note that a larger LSI can incorporate conventional MPEG4.
  • the two image decompression sections N and M based on different image decompression algorithms are provided.
  • an image decompression section L may be provided based on an image decompression algorithm different from the above-described image decompression algorithms.
  • two or more image decompression sections having different image decompression algorithms can be provided.
  • two or more image compression sections having different image compression algorithms can be provided in Figure 8 .
  • the present invention can provide an image information processing system comprising an image input section, an image display section, an image data storage section, and an image data communication section, which can reduce a transfer time in proportion to a reduction in a data transfer amount, resulting in a reduction in power consumption.
  • the data transfer amount of the data transfer bus line can be increased by a factor corresponding to a compression rate without increasing the width of a bus line.
  • the clock frequency of the data transfer bus line can be increased by a factor corresponding to a compression rate, resulting in a reduction in power consumption in proportion to the operating frequency.
  • the present invention can be preferably applied to electronic apparatuses requiring low power consumption, such as mobile telephones, mobile personal digital assistants (PDAs), digital still cameras, mobile personal computers, and the like.
  • PDAs mobile personal digital assistants
  • the present invention significantly contributes to a reduction in the power consumption and an improvement in the reliability of these apparatuses.

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